<template>
  <view>
    <!-- <mySearch :bgcolor="'pink'" :radius="18"></mySearch> -->
    <mySearch @click="gotoSearch"></mySearch>
    <view class="scroll-view-container">
      <scroll-view  class="left-scroll-view" scroll-y="true" :style="{height: wh + 'px'}">
        <block v-for="(item, index) in cateList" :key="index">
          <view :class="['left-scroll-item', index===active ? 'active' : '']" @click="activeChanged(index)">{{item.cat_name}}</view>
        </block>
      </scroll-view>
      <!-- 右侧的滚动视图区域 -->
      <scroll-view class="right-scroll-view" scroll-y :style="{height: wh + 'px'}" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
          <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
          <!-- 动态渲染三级分类的列表数据 -->
          <view class="cate-lv3-list">
            <!-- 三级分类 Item 项 -->
            <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
              <!-- 图片 -->
              <image :src="item3.cat_icon"></image>
              <!-- 文本 -->
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
      
    </view>
  </view>
</template>

<script>
  import badgeMix from '@/mixins/tabbar-badge.js'
  export default {
    mixins: [badgeMix],
    data() {
      return {
        // 窗口的可用高度 = 屏幕高度 - navigationBar高度 - tabBar 高度
        wh: 0,
        cateList: [],
        active: 0,
        // 二级分类列表
        cateLevel2: [],
        scrollTop: 0
      };
    },
    onLoad() {
      // 获取当前系统的信息
      const sysInfo = uni.getSystemInfoSync()
      // 为 wh 窗口可用高度动态赋值
      this.wh = sysInfo.windowHeight - 50
       // 调用获取分类列表数据的方法
      this.getCateList()
    },
    methods: {
      async getCateList () {
      const { data: res } = await uni.$http.get('/api/public/v1/categories') 
      // 判断是否获取失败
      if (res.meta.status !== 200) return uni.$showMsg()
      // 转存数据
      this.cateList = res.message
      // 二级分类
      this.cateLevel2 = res.message[0].children
      },
      activeChanged (index) {
        this.active = index
        // 重新赋值二级分类
        this.cateLevel2 = this.cateList[index].children
        
        // 重置 scroolTop的值
        this.scrollTop = this.scrollTop === 0 ? 1 : 0
      },
      gotoGoodsList (item) {
        // 跳转页面
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?cid=' + item.cat_id
        })
      },
      gotoSearch () {
        uni.navigateTo({
          url:'/subpkg/search/search'
        })
      }
    }
  }
</script>

<style lang="scss">
  .scroll-view-container {
    display: flex;
    .left-scroll-view {
      width: 120px;
      .left-scroll-item {
        line-height: 60px;
        background-color: #f7f7f7;
        text-align: center;
        font-size: 12px;
        &.active {
          background-color: #ffffff;
          position: relative;
          
          &::before {
            content: '';
            position: absolute;
            display: block;
            width: 3px;
            height: 30px;
            background-color: #c00000;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
          }
        }
      }
      
      
    }
    .cate-lv2-title {
      font-size: 12px;
      font-weight: bold;
      text-align: center;
      padding: 15px 0;
      
    }
    .cate-lv3-list {
      display: flex;
      flex-wrap: wrap;
    
      .cate-lv3-item {
        width: 33.33%;
        margin-bottom: 10px;
        display: flex;
        flex-direction: column;
        align-items: center;
    
        image {
          width: 60px;
          height: 60px;
        }
    
        text {
          font-size: 12px;
        }
      }
    }

    
  }

</style>
